Originally Posted by Doc M
The kit contains a spacer that you install on top spring
They call it a preload spacer
This is what I thought you might have asked, but wasnt sure.
The 4" kit does not come with a pre load spacer rather only a 4" strut spacer.
This can be stacked with Bilsteins.
The 6" kit comes with a 4.375" strut spacer and a pre load spacer that always needs to be removed when installing Bilsteins.
Hope this clears it up